package com.yp.lession.util;

import com.yp.lession.dao.TemployeesMapper;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;


import java.io.IOException;
import java.io.InputStream;

public class MyBatisUtils {
     private static SqlSessionFactory factory;
     private  static  final ThreadLocal<SqlSession> THREAD_LOCAL = new ThreadLocal<>();


     static {
         try {
             InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
             factory = new SqlSessionFactoryBuilder().build(is);


         } catch (IOException e) {
             e.printStackTrace();
         }
     }
public static SqlSession getsession(){
         SqlSession session = THREAD_LOCAL.get();
         if (session == null){
             session = factory.openSession();
             THREAD_LOCAL.set(session);
         }
         return session;
}

    public static <T> T getMapper(Class<T> clazz) {
         SqlSession session = getsession();
         return session.getMapper(clazz);
    }

    public static void close() {
         SqlSession session = getsession();
         session.close();
         THREAD_LOCAL.remove();
    }
    public static void commit(){
         SqlSession session = getsession();
         session.commit();
         close();
    }
    public static void rollback(){
        SqlSession session = getsession();
        session.commit();
        close();
    }
}
